High-Purity Calcium Carbonate in Freshwater Clam Shell

The calcium carbonate in freshwater clam shells is similar in purity to that designated reagent grade. A simple reprecipitation of the shell extract results in a product having less Sr and Mg than reagent grade CaCO$_{3}$. Clams are harvested commercially, and discarded shells are a high-quality raw...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1966-06, Vol.152 (3727), p.1368-1370
Main Authors: Nelson, D. J., Rains, T. C., Norris, J. A.
Format: Article
Language:English
Subjects:
Biogeochemistry
Calcium carbonates
Clams
Fractionation
Fresh water
Precipitates
Reagents
River water
Spectrophotometry
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Summary:The calcium carbonate in freshwater clam shells is similar in purity to that designated reagent grade. A simple reprecipitation of the shell extract results in a product having less Sr and Mg than reagent grade CaCO$_{3}$. Clams are harvested commercially, and discarded shells are a high-quality raw material for the production of CaCO$_{3}$.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.152.3727.1368